Wednesday

April 23, 2014

April 23, 2014

Posted by **Delilah** on Sunday, March 3, 2013 at 8:26pm.

Find the surface area of a sphere with a radius of 8 cm.

267.9 cm^2

803.8 cm^2

2143.6 cm^2

201.0 cm^2

Find the surface area of a sphere with a diameter of 12 m.

452.2 m^2

150.7 m^2

113.0 m^2

904.3 m^2

Find the volume of a sphere with a radius of 4 ft.

33.5 ft^3

67.0 ft^3

267.9 ft^3

803.8 ft^3

A pyramid has a height of 5 in. and a surface area of 90 in^2. Find the surface area of a similar pyramid with a height of 10 in. Round to the nearest tenth, if necessary.

360 in^2

180 in^2

22.5 in^2

3.6 in^2

My answers:

1. 803.8 cm^2

2. 452.2 m^2

3. 267.9 ft^3

4. ??????

- Math for Ms. Sue please! Last math questions! -
**Damon**, Sunday, March 3, 2013 at 8:34pm1. 4 pi r^2 = 804 yes

2. 4 pi 6^2 = 452 yes

3. (4/3) pi 4^3 = 268 yes

4. area = constant * length ^2 for similar figures

double the height, multiply area by 4

90 * 4 = 360

- Math for Ms. Sue please! Last math questions! -
**Ms. Sue**, Sunday, March 3, 2013 at 8:39pmYour answers are correct. I don't know for sure how to do # 4. Please post it as a separate question, without my name on it.

- Math for Ms. Sue please! Last math questions! -
**Delilah**, Sunday, March 3, 2013 at 8:43pmOkay thank you anyway! The answer is "2 cm" for #4.

- Math for Ms. Sue please! Last math questions! -
**Delilah**, Sunday, March 3, 2013 at 8:57pmOkay, the answer was 180 in.^2

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